Qiu Kunyuan, Chen Dequan
1997
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Journal
Acta Polymerica Sinica
Abstract
A new kind polyfunctional initiator 4,4’ azobis (4 cyanopentanoyl p methyl anilide)(ACPMA) has been synthesized from 4,4' azobis (4 cyano pentanoic acid) via two steps reactions. The thermal decomposition rate of ACPMA in DMF was determined by nitrogen evolution technique at 65,70,75,80℃, respectively. It was found that the decomposition reaction follow first order kinetic and the activation energy was calculated to be 124 6 KJ mol -1 . The prepolymer containing azo end group can be obtained from the polymerization of monomer, such as acrylonitrile (AN), acrylamide (AAM) using Ce(IV) ion and ACPMA as a redox initiator. The p methylphenylaminocarbamoyl group would react with Ce(IV) ion to form a nitrogen center radical to initiate monomer polymerization and the azo group is reserved. When the prepolymer obtained was mixed with methyl methacrylate (MMA) in DMF reacted at 65℃, the decomposition of azo group took place and resulting macromolecular carbon center radical would initiate MMA to block copolymerization. The purified block copolymers were characterized by IR analysis.